/*
 * @Author: HeAo
 * @Date: 2021-12-27 15:16:10
 * @LastEditTime: 2021-12-27 15:42:29
 * @LastEditors: HeAo
 * @Description: 
 * @FilePath: \study\day02\6-js声明.js
 * 别乱动！
 */
var a;
console.log(a)
a = 1;
var a = true
// var a;
// a = 1;

let b = 'hello';
console.log(b);
{
  let c = true;
}
console.log(c);